I see that Emirates bonuses Head of Family on the points that earned by the family members flying with you. I have booked my family in Biz class from JNB to JFK via DXB this summer. It will be my first flight on Emirates that is actually mileage accruing.

How do I designate myself as head of household to capture the bonus? Also do I get 20% of all miles my family accrues including their business class bonus and first flight bonus?

Thanks in advance for any insight.